Polímeros: Ciência e Tecnologia
https://app.periodikos.com.br/journal/polimeros/article/doi/10.1590/S0104-14282001000400013
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

The Effect of Step Isothermal Crystallization on the Polymer Crystalline Morphology: The Case of Isotactic Polystyrene

D'Alkaine, Carlos V.; Otaguro, Harumi

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Abstract

Simulations have shown that temperature changes during the growth of lamelae/ribbons of a polymer crystal induce alterations in the thickness of the lamelar crystal. Therefore, the lamelae/ribbons would melt at different temperatures. This is demonstrated experimentally here for spherulites of Isotactic Polystyrene (iPS). The results were obtained following the melting process of selected spherulite structures through temperature scanning. The samples, in which chosen spherulites were observed, were crystallized from the melting state at successive crystallization temperatures. Observations of these spherulite melting processes were made with an optical polarized microscope, using a hot stage to apply the temperature scan.

Keywords

Morphology, crystallization, crystalline thickness, spherulite structure, isotactic polystyrene

References



1. Schultz, J. - Polymer Materials Science. Prentice-Hall Inc., New York, pag.154 (1974).

2. Doye, J. P. K. & Frenkel, D. - Polymer. 41,1519 (2000).

3. Heck, B. et al. - Polymer. 41, 8839 (2000).

4. Anderson, K. L. & Goldbeck-Wood, G. - Polymer. 41, 8849 (2000).

5.Doye, J. P. K. - Polymer. 41, 8857 (2000).

6. Miyamoto, Y. et al. - J. Appl. Phys. Soc. Japan. 58, 1879 (1989).

7. Petermann, J. & Gohil, R. M. - J. Macromol.Sci ¾ Phys.,B(16), 177 ( 1979).

8. Verna, R. V. et al. - Polymer. 37, 5357 (1996).

9. Sutton, S. J. et al. - Polymer. 37, 5529 (1996).

10. Keller, A. & O'Connor, A. - Discuss Faraday Soc. 25, 114 (1958).

11. Hoffman, J. D. & Weeks, J. J. - J. Research. N.B.S. 66A (1), 13 (1961).

12. Bassett, D. C. & Keller, A. - Phil. Mag. 7, 1553 (1962).

13. Hoffman, J.D. & Weeks, J. J. - The Journal of Chemical Physics, 37, 1723 (1962).

14. Hoffman, J.D. ; Davis, G.T. and Lauritzen, J. I. - In "Treatise on Solid State Chemistry", N. B. Hannay editor, Plenum Press, N.Y., Vol. 3, pag 497 (1976).

15. Hofman, J. D. & Miller, R. L. - Polymer, 38, 3151 (1997).

16. Lauritzen, J. I. & Passaglia, E. - J. Res. Natl. Bur. Stand. Sect.A, 71, 261, (1967).

17. Mandelkern, L. ; Glotin, M. & Benson, R. A. - Macromolecules, 14, 22 (1981).

18. D'Alkaine, C. V. & Otaguro, H. - FAPESP Final Report Part I, Contract no 1996/6092-7,Chap. II (in English).

19. D'Alkaine, C. V. & Otaguro, H. - FAPESP Final Report Part I, Contract no 1996/6092-7,Chap. I (in English).

20. D'Alkaine, C. V. & Otaguro, H. - FAPESP Final Report Part I, Contract no 1996/6092-7,Chap. III (in English).

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